On Wed, 22 Mar 2006 00:42:29 GMT, G wrote:

(snip)

The trick to bumping up the voltage of a 3 terminal fixed regulator is
to insert a diode between the ground pin and ground (keep in mind to
insulate the tab if you do this!).

Sorry to be a spolier, but according to my data sheets the tab is connected to
pin 2 (whic is INPUT on a 7912 and presumably on other 79XX regulators). So the
O/P is going to have to go the insulated mounting route regardless of the diode.